DPL: first step to make workflow definition plugins

[ktf]

This is the first step towards having the workflow definition inside plugins
rather than in executables. This will allow accumulating plugins which are needed
to instantiate a topology and do the option parsing / topology building only once,
simplifying the current case.

The end goal is to allow the driver to preload certain common services (e.g. ROOT)
and share it among the different tasks (which at the moment it's not allowed because different
tasks are in different executables). Moreover this will allow us to coalesce strictly coupled
dataprocessors and reduce the number of running processes.

For now the plugins are embedded in the executables and behave exactly like before.

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI for c381e69 at 2025-02-18 12:40:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
/sw/SOURCES/O2/13976-slc8_x86-64/0/Framework/Core/src/runDataProcessing.cxx:62:10: fatal error: Framework/WorkflowDefinitionContext.h: No such file or directory
ninja: build stopped: subcommand failed.

Full log here.

[alibuild]

Error while checking build/O2/fullCI_slc9 for c381e69 at 2025-02-18 12:52:

## sw/BUILD/O2-latest/log
/sw/SOURCES/O2/13976-slc9_x86-64/0/Framework/Core/src/runDataProcessing.cxx:62:10: fatal error: Framework/WorkflowDefinitionContext.h: No such file or directory
ninja: build stopped: subcommand failed.

Full log here.